This molecule is involved in repairing DNA and keeps the genes in a cell intact.

BBC: How gene causes breast cancer

The study, which tracked 1000 patients in 16 countries for more than four years, was conducted by researchers from Queens University and Newcastle University in the UK. They focused principally on people with Lynch syndrome, an inherited genetic disorder that causes cancer by affecting genes responsible for detecting and repairing DNA damage.

FORBES: Study: Daily Aspirin Cuts Hereditary Cancer Risk in Half

The enzyme normally is involved in repairing damaged DNA, but in this instance it gobbles up brain cells' energy stores.

FORBES: Repairing The Brain

The enzyme is normally involved in repairing damaged DNA, but in this instance it gobbles up brain cells' energy stores.

FORBES: Repairing The Brain